package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * 小梁不秃捏
 *
 * @author 小梁
 * @date 2025/7/27
 */
@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //1.向菜品表插入一条数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //遍历插入主键值
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            //2.向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }
    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //1.判断当前菜品是否能够删除--是否存在起售中的菜品？
        for (Long id : ids) {
            Dish dish= dishMapper.getById(id);
            if(dish.getStatus()== StatusConstant.ENABLE){
                //当前菜品处于起售状态，无法删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //2.判断当前菜品是否能够被删除--是否被套餐关联了？
        List<Long> setmealIds = setmealDishMapper.getSetmealDishIdsByDishId(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品被套餐关联，无法删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
        }


        //3.删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deletById(id);
//            //4.删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //delete from dish where id in(?,?,?)
        //根据菜品id集合批量删除菜品数据
        dishMapper.deletByIds(ids);

        //根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);


    }

    /**
     * 根据id查询菜品数据
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        //1.根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //2.根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //3.将两次查询的数据封装
        DishVO dishVO = new DishVO();
        //属性拷贝
        BeanUtils.copyProperties(dish, dishVO);
        //手动设置口味数据
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 根据菜品id修改菜品数据
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品表基本数据信息
        dishMapper.update(dish);


        //1.删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //2.重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //遍历插入主键值
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
